Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
tham tuc » tham thuc, thai tuc, nham thuc
dua tren » dung tren
thu sach » thuat sach, thuoc sach, thu hoach
hang tai » hang va, dung tai
va thanh » gia thanh, ban thanh, va tinh
tu sach » su sach, te sach, tu cach
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thuat
tai hoi » tai khoi, dai hoi, tai hai
ky hang » ky nang, ly hang, ky dang
tuc va » thuc va, truc va, tuc xa
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (thu sach)) ky hang tai hoi. hieu va tham tuc va thanh lap ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky hang tai hoi. hieu va tham tuc va thanh lap ((dua tren) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky hang tai hoi. hieu va tham tuc va thanh lap ((dua tren) or (cua te))*".